I'm so glad that people still use those instructions
, we've modified things with the next version and now screw the ramp to the batton rather than the shelf which is much better. Also, I got hold of some rubber gripping (my dad got it from an auto jumble) and have screwed this to the whole length of the ramp, they find it much easier to use. I watched carefully to start with that they didn't chew it.
Also, Rosie-Rabbit - Charlie has been suffering/recovering from EC so has been in a separate cage. I'm about to rebond (fingers crossed) him with Lavender and then he can go back to living with her in their dog crate, he's been left slightly wobbly and with a head tilt so we're going to make a new shelf that goes all across the cage except for the hole for the ramp. Maybe you could try this for you bun?